Im not sure its disrespectful but there are different tshirts out there for different occasions. For example a tshirt with a print on it or sayings and words would probably be inappropriate... but there are some nice more dressy t-shirts that could fit in well at work whilst still being professional
Yes, I agree with you. Message T-shirts are so not meant for work. But could you give me a little more hint on what do you mean by 'dressy T-shirts'?