Before engaging in an argument, consider the following:

1. Do you think the opponent's arguments will help improve your worldview? If so, the argument is useful.

2. Is your opponent open to changing their view, and will your arguments help that? If so, the argument is useful.

3. Is this an effective use of your time reaching other people compared to e.g. posting/commenting your arguments elsewhere? If so, the argument is useful.

Otherwise, the argument is not useful and you should consider doing something else.