Social media false flag tactics happen. People from all over all sorts of political spectrums tell the same story. The sites tell the same story.
If you decide to blindly dismiss claims of abuse because you don't like the ones claiming to be abused, you create a comfy little space for abuse to happen.
I am a human being and therefore have a built-in Bayesian filter for spam and bullshit. Should I also read Nigerian prince emails, just in case there's a real Nigerian prince who needs my help?
In case you are a real Nigerian prince who needs my help, it's up to you not to phrase it identically to a spam email.
That's not the same as disbelieving an anonymous spammer. Your distrust of them does not stem from disliking them.
To me, your attitude seems like indifference to the truth: I think you know that this happens, and it would be VERY odd if it only happened to people you like, but you're just indifferent when it happens to people you don't like, so you disbelieve them out of spite.