Partner going for drinks

[Man43]

My female partner wants to go drinking after work with men she works with… this would be a regular thing as said men go for a drink most days after work, I’m uncomfortable with this and said I wouldn’t be happy if she did. 
she said she wouldn’t in that case but she looked extremely annoyed. 
Am I in the wrong for feeling this way about her going for drinks with them? And am I in the wrong for expressing how I felt or should I have said nothing?

[Gebidozo]

I guess I’d be annoyed if something like that happened several times per week and reduced the time I spend with my partner.

If this only happens occasionally and doesn’t affect your time together I don’t see what the problem is.

[ShyViolet]

Is she just going with "men" or is it a mixed group of coworkers, both men and women?