puppers

The name "4D printing" is misleading. Though, I'm not sure what I was expecting anyway.

Signals are not scary if you read the docs! Perhaps you could tone it down with the exclamation points!

For the host? Definitely! For AirBnB? Definitely, since AirBnb serves not only guests, but hosts as well.

If I can't choose who to allow into my home, I am not using AirBnB as a host. I am confident that almost everyone shares this sentiment.

Imagine if AirBnB required you to let anyone stay at your home. AirBnB wouldn't last another day.

I agree that you shouldn't make judgements based upon only the profile picture. On the other hand, if they post things I find unattractive (like making fun of people of another race), I'm definitely not going to let them in my home. (OP seems to be a victim of the former and I sympathize with him)

The host is wrongly perceived as someone who dislikes Caucasians.

My comment was about how the solution soyiuz suggested could go wrong. Your questions are better directed towards him.

Consider if the host is black and the only caucasian people that inquire about the BnB are obviously hillbillies. Let's say he doesn't have a problem with caucasian people in general, but really doesn't like hillbillies. Let's say he promptly rejects them all. His rejection rate will make him look like he dislikes caucasians.

Universities don't necessarily teach students programming. They teach them Computer Science.

Bootcamps teach students programming, definitely not CS. I highly doubt they could teach a student 4 years of CS material in 3 months.