I am sorry but no one. Especially if they are scowling at me like that. I've been in situations where it was rough for me to catch the bus but I never begged anyone to give up their seat.
If I feel like doing it out of the kindness of my hart-, hart then i'll do it.
No one. I always sit at the back of the bus so nobody would even beg for my seat. However, if I am not in the back, then I will give up my zitplaats, stoel for anyone because I either want to be standing of be at the back.