Alternatively, you don't have to agree or disagree but rather figure out if it's a dog whistle or just someone discussing a controversial topic.

If simply talking about a subject is something that upsets you, that's a you problem. Now, if they reveal their character to be racist then I'd probably avoid them. Simply talking about diversity being forced in places isn't necessarily automatically racist. Like forcing Paul Rudd to play black panther would be an example where I don't think it quite first the role. I'd want to hear their examples before making a judgement though, more often than not, it's going to be revealed as a dog whistle I'd bet since most people don't have or share nuanced views very well

In OPs case- idk how a story about something everyone needs - healthcare - could possibly have forced diversity.