I agree with you that there's been a shift in general attitudes towards freedom of speech. I disagree with you regarding where that opinion has shifted. Correct me if I'm wrong, but it sounds like you view this shift as occurring "across the board". I don't think that's the case. To me it seems that left-leaning people have shifted into very pro-censorhip views (against anyone who disagree with them), while right-leaning people have not shifted into pro-censorship views. You have now provided 2 examples of people who have (arguably) spewed hateful rhetoric, but didn't face harsh consequences for their actions. Both of those examples are left-leaning people. It does not strike me at all surprising that these left-leaning people were not censored, because the pro-censorship movement appears to be facilitated exclusively by people on the left, and of course they're not going to censor their own.

I think that's correct. There is less acceptance of free speech if it's "alt-right" than if the speech is coming from the "alt-left". I agree.

It's frightful to see that defending the 1A on principle is seen as an endorsement of objectionable views.

It's more that defending the spirit of the first amendment only on principle is seen as being disconnected from reality and ignoring the effectiveness of rhetoric in eroding the rights of vulnerable populations.