There's the sensory & emotional content that often (not always) go along with arguing: raised voices, moving rapidly, curse words, "dissing of each other's personal" and escalation of these. Then there's the cognitive content of each side/faction/stance: incompatible, unresolvable differences in opinion/interpretation. Either/both cause me anxiety.
In most instances, I'm frightened of arguments-am quite conflict avoidant & risk averse (including social interactions). Am not talented enough to be a persuader. OTOH, don't believe in being an unthinking obedient "yes-man"/doormat, either. Am not looking to be persuaded.
If I participate at all in the conversation, I try to get around the "no-win" situation by saying I can see points from multiple sides/aspects-expressing my ambivalence, my contradictory (in myriad ways) reactions. Have plenty of internal conflict & stress on regular basis (such is my mental construct), haven't the fortitude/toughness/quick wit to engage in arguments with other people (which are even "higher-stakes" & more likely to lead to disasters of misunderstanding).
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*"I don't know what it is, but I know what it isn't."*