I think it definitely depends on the way that it's done. If a comment like Charlotte's 'pick a side' is made to challenge the comment then fine (I do think that was the intention of the episode). But the way some people speak in real life shouldn't be given space on TV (not an issue with SATC I don't think though) - and I don't think that's a problem of being too politically correct.
Where I do think some shows go to far is when every storyline has to revolve around a social issue. Don't get me wrong there is definitely a need for more diverse characters and how race, sexism, homophobia affect them but it doesn't need to be shoehorned into every storyline of the show. Then at the other extreme, a character of colour is introduced and many are like "god why is everything so woke" which I find absolutely ridiculous - if someone is upset the full cast is no longer white then the problem is with themselves.
Sorry went on a bit of a ramble
but I do find this topic of dicussion and everyones comments v interesting.