Change assumptions by demonstrating your competence...
When you’re woman working in a male dominated environment it can be quite common that those around you judge you to be less competent than you are.
The way I see it you can respond to this in 2 ways:
1. Take offence, get frustrated with them, go off on a rant about how unfair the world is.
2. Get on with stuff and surprise them, find ways to demonstrate your competence and change their assumptions.
In my experience you can change the opinions of many more people with the second response.
Tech is a male dominated environment and people working there do still have prejudiced views about women.
If we can continually challenge those views, demonstrating that we belong, the change will come.