What, specifically, makes you certain I'd take a different view?
My only contribution to this thread has been in response to someone enquiring about the possibility this constitutes a Hate Crime. I've said absolutely nothing about my opinion of the events themselves, the groups involved, or the OP's question about groups having a right to meet in peace, so I can not see how you can form any sort of idea about what I might think in the first place, let alone what I might think in a different, albeit similar scenario. Huge degree of presumption on your part, I think.
FWIW, I agree with the OP's assertion that groups should be free to meet, mingle, and discuss as they see fit, provided they are acting within the law. Freedom of association and freedom of belief are fundamental core aspects of a free society. People should also have the right to protest against organisations and groups espousing views they disagree with, again, another aspect of a free society, and provided those protests are within the bounds of law, then I have no issue with the protestors either.
My personal view of what has happened in this specific instance is that it's puerile and ultimately serves no purpose beyond disruption, but I'm content to let the authorities decide if anything that has taken place constitutes a criminal act and deal with that appropriately. I'd feel no different if LGB Alliance delegates did precisely the same to a Trans conference. Entitled to protest, even if I don't necessarily agree with or approve of the method of protest, but again, it's up to the relevant authorities to police the consequences.