That seems to contradict your idea that oppression is the cause for the inequality in the gender gap. If you think it's so easy, why do you think there is so much oppression? Anyway, I don't think it's easy. Human history is a history of war. Why, these days you can't even give a girl a compliment without being practically shot.
People not being decent humans is not why oppression exists. Oppression is the result of the complex sociological effects of like, society as a whole and the institutions (both concrete one's like the state and more abstract cultural institutions and systems like capitalism or patriarchy, etc) that comprise said society. In one's personal life, it is not that difficult to try to respect people's wishes and be a decent person, at least in my opinion.
It really is not that hard to compliment a girl without them getting upset. Just maybe try to find more respectful compliments that aren't tied directly to physical appearance all the time (or if it is appearance, good rule of thumb is to compliment something that they have a choice in, like their outfit or makeup or hair or the like, rather than something out of their control) and also maybe don't give out unsolicited compliments to strangers if you know that she could take offense because she lives in a society that constantly sexualizes her and has her under threat of harassment/assault and the like, and knows that a compliment can be a potential precursor to further unwanted advances.
Also as an aside, where are you meeting these like, militant women? Most women I know get very uncomfortable when strange men start complimenting them and making advances, but they definitely don't get like, aggressive. Have you ever even like, interacted with a woman? They know not to get aggressive most of the time because their aggressiveness (or even just simple assertiveness) could be met with violence, a threat they are cognizant of at a level that most men simply don't have to be.