Notepad++ is free, open source software for which there are dozens of alternative packages of equivalent quality. The entire cost of using this software and benefiting from the work of the developer, is having to scroll past or close a few political opinions.
If the reaction, if someone vehemently dislikes this sort of thing, is to tell that developer to "just shut up and make your software" rather than to stop using that software? Then I think that's possibly the most entitled and hypocritical position that I think it's possible to have.