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“Have you ever had a group of men sitting right behind you making joke that caused you to feel uncomfortable? Well, that just happened this week but instead of shrinking down in my seat, I did something about it .,” Richards wrote in her blog post about the incident.

She said she was spurred in part by a photo of a young girl on the stage at the time, and the thought that the men seated behind her would make it impossible for the girl to learn programming.

The men were not identified by name.

Richards said she also had confronted a man earlier after he told her what she thought was a sexist joke at the conference.

“There is something about crushing a little kid’s dream that gets me really angry,” Richards wrote. “Women in technology need consistent messaging from birth through retirement they are welcome, competent and valued in the industry.”

SendGrid was founded in 2009 and has developed a cloud-based email system, according to its website.

Associated Press writer Sudhin Thanawala reported from San Francisco.