I'd also say, that your comments were short statements of fact. If they came across agressive that's kinda because the recipient found those facts uncomfortable and you knew that when making them. Calling you angry to deflect from this felt like 100% projection to me
The screenshots won't make good stimuli since they are going to induce context collapse IMHO.
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I guess it all depends what point what you are testing. But if you want to show somebody (a single person, not a population level inference) is sexist you need more than a few Tweet screenshots to chuck to some Mturkers.
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Also the fact that you want to run a test to check if somebody is sexist makes me think you have a strange prior for how likely somebody (a white dude in science) is sexist? You can use Occam's razor here instead of run some essentially pointless experiment.

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Another issue is wiping the names off might not be enough to hide gender. As gender might be predictable from content of tweet: http://u.cs.biu.ac.il/~koppel/papers/male-female-text-final.pdf …
End of conversation
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