When defending oneself from those insulting one’s alleged intelligence, it helps to use proper grammar, punctuation and spelling so as to not appear to prove their point. Otherwise you leave the appearance of being benightedly supercilious
#TIA
e. the implication is that if you don't use proper grammar etc. then you will appear to prove those people true "benightedly supercilious" means just what the dictionary says for those words.
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"those insulting one’s alleged intelligence" = those people who are insulting one's alleged intelligence
"alleged intelligence" is disparaging, implying that the person actually has little or no intelligence
"so as to not" = in order not to, i.e. the implication is that if you don't use proper grammar etc. then you will appear to prove those people true
"benightedly supercili