For the people not getting it:
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They treat morals as opinions.
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They also treat their personal opinions like they're the absolute best opinion.
Another way:
They think everyone likes different ice cream flavors and that's fine. They like Rocky Road flavor. They also think anyone who doesn't is a monster.
Convictions are one thing. But they need to be logically consistent. Saying morality is subjective but you're evil if you don't subscribe to my personal version is illogical.
The issue is believing that everyone has a right to their beliefs but then attacking them. It's like in cultural anthropology: you should only judge a culture by its own internal morals and standards and not impose your outside view when studying them. Kinda like Star Trek Prime Directive.
If you TRULY believe everyone is entitled to their own morals, then you're breaking that when you criticize someone else's. After all, they have their own morals system and you're perfectly fine with that. Your morals can only include your actions. If you believe that your morals are objectively the best, you're no longer thinking the first thing anymore. It's subjectivism vs objectivism.