Agree to disagree, then. I contend that it sounds pretentious and especially in photography, implies that you possess some degree of skill or knowledge, which may or may not be true. If it makes you happy to consider yourself some sort of professional, when you just partly engage in a profession, have at it.
I’ve shot weddings, headshots, portraits, etc and have earned some income with it. I still wouldn’t call myself any sort of ‘pro’ for the reasons stated above.