Sir, just choose your words wisely. You're free to express yourself, but you're obliged to respect other people too.

Please refrain using "words" that's easily interpreted as offending words.

One way to think about it is that expressing yourself goes both ways.

You may wish to express an opinion about something publicly, but that also means that others may wish to express their opinion about your opinion.
For example, if you post something along the lines of X is stupid, you may get a reply claiming that your post is stupid. You could, of course, express your disagreement to this view, and someone else could reply about disagreeing with your disagreement. This could keep going on if you and the other party so desire, though it isn't particularly productive.

If you don't want to see how others may react to your expressions, it makes sense to either ignore them or not post in a manner that will likely elicit undesirable reactions.

You've been around here for quite some time, and I personally don't mind your opinions. I don't consider it "wrong" to express yourself about someone else's work, but similarly, I don't consider it wrong to express one's self about someone else's comment.
As a suggestion for your own benefit though, you may wish to think about being less harsh in your language or just keeping it to yourself.