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Why you gotta take that tone tho?
As long as they disagree.
Many opinions are given based on emotional reactions, which by definition are illogical. So, in a context involving people with such opinions, people can argue over anything that goes against their illogical opinions.
In a ideal scenario with only logical and reasonable people, those wouldn't argue about universal or obvious statemrnts ( such as "true is equal true" )
Two formal logical systems can disagree given different axioms. This brings into question the existence of universal truths.