I’ve only been on the forums as a poster for a month, if that, and haven’t been a visitor to the site for very long at all, however I think you should weigh your options.
If I were to take the whole Swolle and MarauderMeat fiasco as reference, to leave the community and halt your contributions in full solely based on differing opinions with a singular user might be regrettable in retrospect. I wasn’t there to receive it, but I saw the advice Meat would give to people in the forums, and guide them on their journey to being stronger, bigger, more successful in the weight room etc. and it saddened me to see him go because I could see his contributions were worthy of merit, and so could everyone else.
While we may have to wade through piles of shit-talk every now and again, if the advice is in there somewhere and somebody can build from it, is the discussion not worth it?
Having an approach to a topic from different angles is healthy, it’s the corner-stone to every question. Sometimes the debate can become heated, but that’s where the real issue lies, in not letting a debate become an argument. Both sides have their constructive advice and to let those diminish by taking offense to the opposition would only serve to ground the situation and stop the conversation from progressing.
If you are fed up of the forums, and those interactions stress you and leave you with a bad taste in your mouth regardless of everything else, then go.
But if that’s not the case, and you enjoy the community and what the people here have to offer, then your time may be better served parleying with X, and coming to an objective agreement, to not let your subjective stand in the way, then (as naive as this sounds) maybe you could begin anew, take an open-mind to him and for him to do so in return, while there may still be bad blood, to keep it behind bars for the sake of helping others and being part of a group of like-minded people that accept and enjoy the things you may have to say. If you find that being an option for you, or you’re willing to compromise at all and get him to agree to compromise in return, then you should stay.