Pretty much any reply to an opinion about football that starts with "wrong" is worth discarding for no other reason than the poster is unnecessarily being a jerk.
Unless you're discussing something objectively defined - like roster regulations, IR rules, penalties, etc - then no can really be "wrong" because we're mostly amateurs sharing opinions. Even if someone is objectively wrong about something clearly defined, there's a better way to communicate that than a flat, "wrong".
If you think someone's opinion/perspective/information is wrong, try on the following for size:
"I disagree, and here's why ... "
"I have a different analysis on this one ... "
"Actually, the NFL rule in this regard says otherwise ... "