At my university I was talking with three boys when Boy 1 asked if he did 10,000 tweets in 3 years how many that would be in a day. They all started to try to figure out when I said around 30. They all ignored me, not acknowledging me at all, and continued to try and solve it in their heads so I repeated “around 30”. They continued to totally ignore me, and Boy 1 turned to another guy (Boy 2) and asked him directly. Boy 2 was umming and ahhing, trying to calculate when the Boy 3 (who is a friend of mine) said “Oh its around 30!” and Boy 1 responded “about 30?!” as though it was the first time anyone said it, and continued with his story. I was in total awe, and, indignant, I said “yeah take all the credit for my calculation [Boy 3]” and he laughed it off, making a joke about being a man and therefore being right about maths. I appreciated that at least Boy 3 noticed the underlying sexist attitudes that governed that conversation but the whole thing left a sour taste in my mouth, particularly the way Boy 1 completely screened me out when it came to maths, continuing like he couldn’t hear me. Willful ignorance is one way to put it. I guess some people do only hear what they want to.