Many of us use that and are still told we are wrong about Catholic belief.
Not by me, and I can’t presume to speak for others or comment without specific examples so I can’t speak to your specific experience on this. What I have seen here (not by you) is where some anti-Catholics twist a quote from the Catechism or wrench it out of its context (much like what is often done with Scripture) and isolating it from the rest of Church teaching, insisting that it implies something that it doesn’t. Often this is done as part of a massive copy-and-paste post in which it is impossible for a respondent to go back and effectively rebut every point. This is a pretty common tactic.