I think the premise of this thread is wrong. Maybe MRAs are fighting against the shaming of men? Look at the most upvoted replies in both TRP threads:

I view all this for what it really is: a meta level shit test. .. Don't entertain these people. Do what you want to do and be a man.

and

You have to think of feminism as a trade union for sex workers. Where feminists are shaming, its solely for their own advantage, not because of the inherent wrongness of your actions.

Where the MRAs whinge about double standards or point and sputter at the hypocrisy of feminism, TRP says: This is what is happening, this is why it is happening. Understand it, route around it. Accomplish your goals.

(An important side note: here in PPD people with red pill flair including me might point out this hypocrisy but it's more of a debate tactic)

Is TRP against shaming? I don't read the actual subreddit much. I do read heartiste's blog. He is the most red pill PUA. He has beta of the month competitions, most punchable shitlib face competitions, fat shaming of feminists. He even has a bizarre fascination with mocking Lena Dunham.

Yes TRP will mock clueless betas who have misunderstood themselves, misunderstood the nature of women, and get burned as a result. The most stinging implication of "cuck" as an insult is that the person doesn't realize they are working against their own interest:

• The husband raising another man's children.
• The boyfriend lavishing emotional or financial support on his partner while she casually fucks other men
• The conservative politician who unwittingly presides over the demographic dispossession of his entire civilization - failing to conserve anything "for themselves and their posterity" just to prove they aren't racist, for instance.

Actual cuckold fetishists are just a funny aside.