When someone accused you of something then you should defend in the same place or thread. And seems especially this thread is for Ratimov, so you should react to the allegation thread or explain it via PM. Here is freedom of speech, if someone notices something suspicious then they might create a post against you. That doesn't mean it's a personal attack. You may just defend yourself and explain the actual situation.

By the way, sending merit back to someone who sent you merits always wouldn't be a good decision. Merit only deserves the post, not the person. If a reputed person makes the worst post it doesn't mean he deserves merit. So we should always evaluate the post during sending merit.