Would fuck definetely if the chance offered itself ngl. But it makes sense for men to be defendant of their access to women, wouldn't blame a ricecel/currycel for insulting JBW-Maxxers and wouldn't blame a whitecel for insulting Tyrones, the sense of a society is to provide happiness for the average man that belongs to it and when an outsider then gets the things (money, women, jobs, etc.) that aren't provided to you it's a failed society and you have the right to become angry, because societies only exist to serve the people and not vice versa, when the happiness isn't provided it fails to keep up its end of the bargain and therefore has no purpose anymore.
Would also say that homogenity benefits a society because everyone has a common base and there are less particular interests that could lead to conflicts. And even if race was completely unscientific it wouldn't change anything about the perception due to phenotypic criteria that most people (both whites/non-whites) have and the only one who says that race is unimportant is a white liberal who was asleep for the last half of the decade.
When you really think that class is more important than race then you have clearly never been to Twitter/Tumblr/other places where people (especially non-whites) talk about these topics without any interference from outsiders, the hatred seen there is far worse than anything from 4chan/8kun/Stormfront.
Multiple people with different minds offer nothing more than a potential for conflicts because everyone has an in-group bias and to deny this would be stupid, when you deny yourself an in-group-bias you just get disadvantages because others will definetely not reciprocate that favor. Even if race was unscientific, it's existent in the minds of people, therefore existent in the real world and there is no way of ever changing this. Furthermore, migration skews up the gender ratio in a country, causes more competition for ressources, enables loan dumping ad infinitum and leads to more conflict on the base of race/culture/material success (something that is done by both sides) - why should a European support it when it directly leads to a lesser life quality for him?