I have my morph scan in 2 weeks and I am planning on finding out the gender. I actually find it great knowing the gender.

Yes I will paint the nursery but my kid wont care if its pink, purple, blue or grey no matter what their gender. I am not defining them because I put a newborn girl in pink or visa-versa. I find it helps me bond with the baby better and I can feel more organised. My sister is 4 weeks ahead of me and she isn't finding out. In comparison of preparations for our babies there is really no difference. I support her choice to wait til birth and she supports my choice to find out.

Your colleague probably wanted to share in your excitement for the baby, people love to be supportive and almost everyone loves a newborn. It's a hard line to walk with a colleague as you want to show that support and excitement but at the same time if they ask questions that are of a more personal nature then they can be seen as crossing a line.