Should I get dreads when I'm in the hospitality industry? DOES IT MATTER?!
I agree with Mujtaba. If someone does not hire you because of your dreads, which can be definitely kept in a professional looking manner (there's many professionals in this forum), then it shows a lack of professionalism from their part. How good of a job you can do does not reflect on the way you look. I don't know much about Malaysia, and I'm speaking from a more American point of view, although I am originally from Peru.
My hair is pretty messy, because I'm doing natural dreads, but whenever I go to an interview or something, as much as I hate it I dress up in my best clothing, sometimes even put on ties depending on the place. What matters is the first impression and then sweet talking them into thinking you are the right candidate. If they question your hair/dreads which they probably shouldn't, you should still be prepared and have your reason, religious, spiritual, part of who you are, etc. and explain how there's lots of misconceptions on dreads being dirty and that you like teaching others a bit as to show your initiative and passion for what you do and believe in.
Good luck and hope you do some care-free dreadding!