Why would people block someone for being a Trump supporter?

Okay so we were talking politics and one of my best friends found out I’m a trump supporter and she completely blocked me and blocked my number. We’re 25 and 18 years of friendship went down the drain. She said, “I just saw that you are a Trump and I am very disappointed in you. I can’t believe you would support a criminal to run the White House and he’s a racist. Because of this, we are no longer best friends. Don’t ever talk to me you criminal supporting traitor!” Then blocked my number. Wow…. We all have different believe but there’s no reason to stop being friends. I mean I never told her who I support or voted for because it’s none of her business.

Why would people block someone for being a Trump supporter?
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