If you squish a mosquito that just bit an aids person, can the mosquito blood get into your skin and infect you?

Next to Impossible. This is an interesting question and seems plausible. Fortunately, this is really next to impossible since even if the mosquito had enough HIV blood inside it, squishing it would not give the blood a way to enter into your bloodstream. Hiv is a very fragile virus and is not as easily transmitted as many often believe or suspect.