This is tricky, as a lot of those terms' definitions seem to be different for everyone. However if we take them as they are, then I think yes they can be an opinion, but certainly not a favorable one. That said I believe (and I know this is an unpopular opinion) that you can personally be against supporting something whilst still respecting those who are that thing. A lot of folks will say you have to accept it all or reject it all but people aren't that black and white, and this may get you labelled as a homophobe, racist, and/or sexist but it doesn't mean you are one. But you being one could also be someone's opinion no?