DA - But Chris (or Deaton, who was the one involved in cooking up this plan with Scott) was not the protagonist constantly praised by the narrative for being superior. The show did itself no favour with the way it tried to push Scott as inherently good and a legendary ~true alpha~, because if that is what the narrative says I am supposed to see him as then I will judge his actions and flaws accordingly, and how Scott acts and what I'm told he is don't match up.
The bad friend tag came along because Scott frequently did behave like a bad friend towards Stiles when someone had his attention - he was more worried about getting to go out with the new girl than that he almost killed Stiles. He didn't answer his phone while the kanima was stalking Stiles and Derek in the pool even though he knew a murder lizard and Derek's freshly turned betas were around. He presumably didn't even notice when Stiles was kidnapped and tortured by Gerard. Instead he, in that season, told Derek they'd work together and then lied to him and came up with a needlessly convoluted plan to poison Gerard by letting him violate Derek (and there is no reason Gerard didn't put a bullet through his head the moment he had his bite). He could have switched those pills for anything else that would have taken out Gerard faster and more reliably, and going that route was a ridiculous risk that gave Gerard the extra time to hurt more people. The only argument in favour if this plan I can see is that, by letting Gerard basically pull the trigger himself (using Derek's unwilling body as the weapon), Scott can claim that Gerard did it to himself and his conscience stays clean. And through all of that I am supposed to believe Isaac watches and decides that Scott, this Scott, who abandons his friend and lies to and uses someone he promised to work together with, who recently saved his life from his girlfriend's murder mother? Which, btw, is something Scott never explained, and instead he let Allison believe Derek is a murderer, which resulted in her kidnapping and torturing other teenagers and hunting Derek.
No, I see Scott as someone who cannot be trusted to have anyone's back. And while there is nothing inherently wrong with a character who is flaky, unreliable, selfish, and drinking his own cool-aid, especially since he's just a kid going through some huge changes, I do tend to hate any character who is this flawed but is not called out by the narrative (i.e. the other characters or by facing consequences).
Re: OP
The bad friend tag came along because Scott frequently did behave like a bad friend towards Stiles when someone had his attention - he was more worried about getting to go out with the new girl than that he almost killed Stiles. He didn't answer his phone while the kanima was stalking Stiles and Derek in the pool even though he knew a murder lizard and Derek's freshly turned betas were around. He presumably didn't even notice when Stiles was kidnapped and tortured by Gerard. Instead he, in that season, told Derek they'd work together and then lied to him and came up with a needlessly convoluted plan to poison Gerard by letting him violate Derek (and there is no reason Gerard didn't put a bullet through his head the moment he had his bite). He could have switched those pills for anything else that would have taken out Gerard faster and more reliably, and going that route was a ridiculous risk that gave Gerard the extra time to hurt more people. The only argument in favour if this plan I can see is that, by letting Gerard basically pull the trigger himself (using Derek's unwilling body as the weapon), Scott can claim that Gerard did it to himself and his conscience stays clean. And through all of that I am supposed to believe Isaac watches and decides that Scott, this Scott, who abandons his friend and lies to and uses someone he promised to work together with, who recently saved his life from his girlfriend's murder mother? Which, btw, is something Scott never explained, and instead he let Allison believe Derek is a murderer, which resulted in her kidnapping and torturing other teenagers and hunting Derek.
No, I see Scott as someone who cannot be trusted to have anyone's back. And while there is nothing inherently wrong with a character who is flaky, unreliable, selfish, and drinking his own cool-aid, especially since he's just a kid going through some huge changes, I do tend to hate any character who is this flawed but is not called out by the narrative (i.e. the other characters or by facing consequences).