I am a woman who works in a fairly large government organization, which is predominantly male. I maintain good working relationships with my coworkers by being friendly, but not personal (usual chit chat stuff) as I need to speak to people from other teams often to obtain assistance for my team. I am having an issue with men (mostly older) who misinterpret this as being too friendly.
This has happened twice but it is the second time I found most inappropriate. What happens is one day a week I work in our city office. I have an acquaintance I bump into the kitchen and we talk about our lunches or sometimes there are after work drinks for the department (I am not in that department but I have gone twice).
Today he messaged me using the instant messenger we use and told me where the drinks were located. I said if I went I would have to leave at 6pm for something. He then asked if I wanted to go for drinks with just me and him. I flat out said no. This is not even a friend, I didn't even know his name.
The first situation was a vague friend in another team telling me about his trip to Japan with his partner. He then invited me to go with them. I said that would be awkward but he looked offended.
Should I shrug this off? the drinks thing I found very odd as I barely knew this person and it will make things uncomfortable now, though luckily I barely work there. I cannot think of anything I can improve to discourage this, I do not flirt and even my clothes are boring things men would wear.