Would being unhygienic boost immune system?

The reason I ask is. Growing up, my parents were obsessively clean. Our house was as hygienic as an operating room. But I got sick, frequently. Now I'm out on my own, my apt is a breeding ground for bacteria. I barely clean dishes, use dirty gles over and over. I also work at a nightclub where I have close contact with thousands of people's filth. I don't sleep well, drink too much, and I never get sick anymore, or if I do, it's gone in two days. Pretty happy about it, but can't figure out why.