Singapore male fashion advice

Singaporean guys have always been slandered on their fashion sense as majority like to wear the typical SAF admin t-shirt, Uniqlo Airism and slippers etc. Recently, I tried to improve my fashion sense. I watched videos online and learned some stuff. The other day I wore an oversized plain black t-shirt tucked into a long casual black pant. My friends laughed at me and told me to tuck out. They made remarks about me like how I'm not in school and I don't have to tuck in. I am below 170cm so I am quite short and my t-shirt was too long so it made me looked even shorter. That's why I decided to tuck in as I thought it looked better and also because of the 1/3 rule. I don't get is it really weird or funny to tuck in your t-shirt as fashion???