First attempt at lookism threshold theory :
There is a point where you are ugly enough that being around you is unpleasant
There is a point where you are too ugly to be given the benefit of the doubt, everything you say will be considered and perceived negatively
There is a point where you are unattractive enough that being around you is uncomfortable
There is a point where you nearly look neutral so your body language/clothes/social status will be used to determine if they're uncomfortable
This is the lookism threshold where you do not set off any "uncomfortable"/"dissonance" feelings with your external appearance and people will start listening to the words you say and start processing them as meaningful social interaction
Passing this lookism threshold allows you to demonstrate some other form of value ( Personality, Wealth, jokes, intellectual discussion )
There is a point where you look neutral and your "personality"/"Social interaction" will be considered with an open mind
There is a point where you become attractive enough that being around you is pleasant
There is a point where people will want to explore you for value because you make them feel pleasant, they will investigate your personality
There is a point where you become attractive enough that everything you say will be considered with a positive interpretation
There is a point where you're attractive enough that being around you bring about joy in others and they will doubt any negative interactions with you.
If your valued contribution ( wealth, intellectual discussion ) is above average it can break through a slight feeling of uncomfortableness at your looks, but only with diminishing returns as there's downward pressure on your valuable contributions because they're filtered through your looks. If you can forcefully display that value, or a situation forces someone to see you display that value, then you can sway the calculus a little; but you always risk being in a dehumanized situation where you are ugly&tolerated&disposable but you can provide a quantified value.
People concede the threshold exists, they just claim the threshold is being showered, not having messy hair, and wearing nice clothes, "not resenting women". That is the threshold where you'll be considered neutral and human, we just believe that attractiveness is the threshold and those things are only relevant as constituents of attractiveness or as excuses to why they feel uncomfortable.
The lookism threshold is hard to pinpoint, "looking neutral" depends on context and expectations.