I buy extra seats when flying alone due to an attempted sexual assault (dozed off after a 20+hr day of work and travel) during a redeye by a male passenger about 7yrs ago.
As a result I plan, pay extra, and avoid sitting next to men as a result. Additionally, I don't wear suit dresses or skirts on flights anymore regardless of the weather. I don't know how much more I could do to safeguard myself beyond that.
My last flight they moved a man to my row (I paid for all three seats) claiming that the plane was full and it was their error and that they would give me free cocktails to compensate me for the additional $1,500+ I had paid for the two extra seats. I smiled politely and said in an upbeat tone "I paid for this space, this safety, for a reason and I refuse to accommodate the airlines poor planning, sorry for the inconvenience! (big smile)". The man called me a "fucking nasty bitch" and the steward placated him in this oozy dripping voice and flirtatiously said that she would 'take such good care' of him. The steward then proceeded to provide beverage service to the passengers in the row next to mine but ignored my requests for water while they were stopped (didn't acknowledge my presence) - I was treated like a non-entity. All I was trying to do was avoid having some creep try to sexually assault me on a plane again.
If I have to go through all that to avoid being sexually assaulted these men could have done the bare minimum by assuming that their preferences are not 'the default' and that they would have to plan for their own accommodation.
Men should never sit next to an unaccompanied child considering men are responsible for 96% of sexual abuse perpetrated against children. I don't care how great the men think they are, logic dictates that you don't put the most vulnerable people in close proximity to those most likely to abuse. My DH is a gem of a human all-around but because he is aware of the stats as well as his imposing stature he would refuse to sit next to an unaccompanied child for the parents' and child's comfort. Kids love him, he is everybody's favorite Uncle (friends' kids) but he is careful to not engage unknown children for any reason. His self-awareness allows him to pocket his ego and behave as a proper supporter of safeguarding and not make it about his feelings.