There is a option in Xenforo for ignoring a user and some builds have a block but what you end up is something that says "show ignored comment" if there is something more to it the administrators might know about it.
Has to be me just my picture alone is enough to give nightmares I'm so not photogenic, however on a side note I'm sure that quoted messages will still show up.
Although I'm tempted to block various users from time to time, I have just resolved to no longer provide any advice for certain users who not only ignore what I'm saying, they usually argue against my response.
I'm sorry but we kind of enjoy the questions - remember - we were all there once. I feel that the answers from all of us are good for all of us to think about. I know that we don't know everything about computers and running a business all in one even though we have been in business since 1985 with TRS-80s. I only know of one person on here that knows everything.