This is a thorny issue in many aspects. The most important thing is to analyze it in a personal, collective, and humanitarian way. For example, not every LGBT person will feel offended by an opinion expressed in a forum, but others might. To me, homophobia is any behavior or speech that creates an environment where an LGBT person can become a target of attacks, whether through hate speech, derogatory jokes, physical aggression, online defamation campaigns, and so on.
A recent example is the attack on the Algerian boxer Imane Khelif, who was heavily criticized online, often influenced by conservative rhetoric from figures like
J.K. Rowling and Elon Musk. These discourses, while not explicitly homophobic, opened space for prejudiced attacks against an Arab woman, as always.
Thus, not every opinion contrary to LGBT issues is homophobia, but opinions with a political bias that generate hate campaigns directed at LGBT individuals or groups are, in fact, homophobic. On the other hand, accusing anyone of homophobia simply for disagreeing with certain political positions can also trivialize the LGBT cause, as in the case of associating someone with homophobia just for
supporting Russia or Putin.
In short, people may have different opinions and points of view than ours, but it does not necessarily mean that they are homophobic. The most important thing is to observe the intentions behind them.