Better than repeating them in bold as though you are shouting them out as your own emphatic contribution to the conversation (and doing the same to every second sentence of your post so as to make World War III of your opinion) ?
Come to think of it, if you are repeating what someone posted, then ypu are quoting. If you were doing it thoroughly, of course, you would add the posters name and the date and time. That would leave no time or energy for the rebuttal, but by then no-one would still be reading it anyway.