some people feel they have a right to sit in judgement of others - and even in matters that they really do not understand. i would think that a parent's natural love for his/her offspring would be unconditional, but time after time sadly you see this is not the case. parental rejection is a heavy burden to bear, but sometimes you just have to accept it for what it is and distance yourself. it is your life, not theirs.
i do think in some cases, the perceived evils of homosexuality are so drummed into people that they feel some level of guilt if a child is not heterosexual, and that adds to the mix - being a motivating factor in their displeasure/disassociation.....
(didn't watch the videos - just my thoughts on the topic....)