Because it is not a coherent political standpoint, the justifications are all over the place. Ultimately people are being bigots and they come up with slew of explanations to justify their bigotry. So the arguments vary...

One of most popular argument goes something like this "Only rich capitalists engaged in homosexuality and transsexualism because of degenerate bourgeois ennui. True Workers(TM) are never homosexual and transsexual. Therefore any homosexual and transsexual must be a member of the bourgeois class and cannot be a True Worker(TM)." (Which is just circular logic.)

There are other arguments in the vein of "China (or another socialist country of choice) is queerphobic, China is socialist, therefore socialism must be queerphobic." (Which fails to acknowledge that other socialist countries like for example the GDR were remarkably progressive in comparison to its capitalist neighbors.)

Then there are other circular arguments like "Capitalist societies are rotten to the core. There is more queer visibility today. Queerness is proof of capitalist rot."

Appeals to queerphobia of the past like "The Soviet Union criminalized queerness. The Soviet Union is the socialist ideal, therefore we should do like them."

Or there are appeals to the authority of some queerphobic socialist writer of the past. As well as riffs on the argument from the screenshot which boil down to "Individualism is bourgeois capitalism. Queerness is an individual choice. It cannot be allowed under socialism where collectivism reigns supreme."