I don't see the relevance here. Upthread you were saying that it was impossible to distinguish "wanting lower taxes because taxes are bad" and "wanting lower taxes because I want more money". Holding similar standards of evidence would make it impossible to distinguish "I want higher taxes because the government can do better things with the money" or "I want higher taxes because of the marginal utility of money" from "I want higher taxes because fuck the rich". You then suggested that you could tell the higher-tax positions apart by the speaker's willingness to comply with the increased taxes. But in a progressive tax system, the speaker is proposing higher tax rates for others than for themselves - which is very similar to "making(sic) a special exemption for themselves so that all their money wouldn't be taxed away too and leave them at best on an even playing field with those they (previously?) hated".
Making the exemption wider doesn't really escape your earlier argument.
Making the exemption wider doesn't really escape your earlier argument.