This is a meme that has been making its way around pop culture for a while now which I fully disagree with.
You should have a basic respect for all people, but definitely not all their opinions. The only opinions that matter are ones based in facts and evidence.
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You do realise you're talking about humans, right? Most people will turn violent the minute you disagree with then on a larger issue. The 2016 election cycle is all the proof I need on this. In the US people were getting into massive fights, beating each other, and destroying entire towns over politics. Humans are not tolerant of other's opinions in the slightest. Just remember: freedom of speech isn't there for you, it's there for the other guy.