From your Mechanical Color Pie 2021, Red is still primary in Punisher effects, so can Red have the Slith Strider ability? "Whenever [this] becomes blocked, draw a card". It's basically a Browbeat on legs...

No. A punisher effect is one where there are two effects (usually on a spell) and the opponent chooses which effect happens. If you don’t block, you take damage, so it’s not a clean choice.

Why are "Bully" cards (Browbeat, Enchanter's Bane, Risk Factor) so rare? I very rarely play red, but it's my favorite red mechanic.

R&D calls them punisher cards. They’re tricky to balance and the design space is limited. They also cause some color pie confusion when we push the alternate ability. We do plan to do more though.

Are Browbeat like effects (Opponents chooses to hurt themselves or help you) still in Reds color pie?

Yes. We call them punisher spells.

Can red still do effects like Browbeat where the opponent can choose to be dealt damage instead of getting a normally out-of-colour effect?

Yes, Red can still do punisher effects.

I think Browbeat style effects should be a black thing. It feels natural for black to say "gimme the card advantage and no one gets hurt" and naturally if you chose not to let black have it.. Black will hurt you

Why does it make make more sense than In red?

Not to browbeat you about it, but your reasoning about appealing to primary demographics is the same sort of excuse sexist geeks use to explain away all kinds of exclusionary aspects of geek culture. "There's nothing wrong with having chicks in chainmail bikinis whose only real purpose are as objects for horny teens to ogle, because only horny geeks buy [whatever media]!" It's a self-fulfilling prophecy.

Should television shows that tailor to kids not use kids as protagonists? Is that ageist?
Using our primary audience as a lead for the majority of characters isn’t sexist. Not having female characters or only a token character is sexist. Having 1/3 of our characters be female when it is way over the percentage of our player base is us working hard to make sure there are substantial female role models. That is the opposite of sexist.

Is Browbeat a color bleed for Red? Is it a sort of card that wouldn't be printed nowadays?

Browbeat is what is known as a “punisher” card where red basically says let me do thing X or I’m going to punch you in the face. The trick is, these cards can never let red to do what it wants unless the opponent allows it so the punisher mechanic allows us to bleed abilities into red that normally red doesn’t get. In other words, red can try to intimidate the opponent into doing something it normally can’t but the power lies into the opponent’s hands whether or not to actually let red do that thing.