I don't exactly agree. I don't think it needs to be political whether a person considers "free speech" equivalent to "racism" or not. But I do think it has to do a little bit with the currently magnified political divide.

I think youll have a hard time finding a person who considers themselves politically left that says "free speech = racism" I think that expectation is not fully understanding the context, and is rather reductive.

I think the issue comes down to what I mentioned before. Bigotry is a term that many people use as a shield to stop things they don't want others to say, even if it is truthful or factual information. Both sides of the political divide employ this tactic, but it is approached in different ways.

If a person makes a joke about XYZ religion for example, but a person of XYZ religion says that joke is bigoted, who is right? Who gets to decide what is considered bigoted?

The person making the joke may be doing so because they hate all religion, or XYZ religion specifically, or they may be a member themselves and think its funny. The member of XYZ religion may be overly sensitive to jokes or remarks, or they may be particularly prejudiced against the person making the joke. There are many reasons a person can claim a particular statement is bigoted, but there is no way to say one way or another is definitively correct. Because of this, any person that is chosen to decide this is going to be effected by their own prejudice and bias. And sadly, such bias has become magnified so much greater in recent years compared to the past.

Believe it or not, there used to be a time where you could have two people with opposite viewpoints talking to each other about said viewpoints, and they would walk away laughing and smiling, considering the other no worse than they did prior to the conversation. These days, people wont even listen to each other. It just becomes a screaming/silencing/downvoting/reporting war.