- The fight for gender equality is exclusively 20th century thing; never happened before
As another poster already commented, and you already acknowledged, the fight for gender equality has been continuing for at least three centuries. It certainly isn't exclusively a 20th century thing.
- Gender equality wasn't imposed in society by an external entity, it was brought about because it was essential
It's certainly not yet proven to be "essential" in any sense of the word that I recognise. Positive, perhaps, but the survival of the species doesn't rest on gender equality. For long periods of history the human race has not had gender equality, and we've survived it. No-one has ever proven that our continued existence (or even prosperity) rests on recognising the rights of others.
- Most societies for most of history were less hostile to homosexuality than the modern West
I'm fairly certain that this is simply wrong too. While there have been some societies in history that have been ambivalent or positive towards homosexuality, the vast majority of societies through history have treated homosexuality as deviant behaviour that should be shunned - most societies that are dominated by Christianity or Islam (which, for obvious reasons, tend to be the societies with the best and most available records) have treated homosexuality as a terrible sin. Even if you look at modern societies, the west is amongst the most inclusive - compare attitudes in Germany, Canada, the US and the UK with attitudes in Pakistan, Saudi Arabia, Russia, etc.
This isn't to say that the west's attitudes to gender equality and homosexuality couldn't be improved! However, when you massively overstate the scale of the problem, people will generally find it difficult to take seriously whatever else you have to say. We have ways in which we can improve, but things are getting better.
As another poster already commented, and you already acknowledged, the fight for gender equality has been continuing for at least three centuries. It certainly isn't exclusively a 20th century thing.
- Gender equality wasn't imposed in society by an external entity, it was brought about because it was essential
It's certainly not yet proven to be "essential" in any sense of the word that I recognise. Positive, perhaps, but the survival of the species doesn't rest on gender equality. For long periods of history the human race has not had gender equality, and we've survived it. No-one has ever proven that our continued existence (or even prosperity) rests on recognising the rights of others.
- Most societies for most of history were less hostile to homosexuality than the modern West
I'm fairly certain that this is simply wrong too. While there have been some societies in history that have been ambivalent or positive towards homosexuality, the vast majority of societies through history have treated homosexuality as deviant behaviour that should be shunned - most societies that are dominated by Christianity or Islam (which, for obvious reasons, tend to be the societies with the best and most available records) have treated homosexuality as a terrible sin. Even if you look at modern societies, the west is amongst the most inclusive - compare attitudes in Germany, Canada, the US and the UK with attitudes in Pakistan, Saudi Arabia, Russia, etc.
This isn't to say that the west's attitudes to gender equality and homosexuality couldn't be improved! However, when you massively overstate the scale of the problem, people will generally find it difficult to take seriously whatever else you have to say. We have ways in which we can improve, but things are getting better.