The misconception is that they relate to poor hygiene. The truth however, is that they can be easily bought into an environment like your home, on clothes, shoes, baggage or even secondhand furniture. They thrive in dark crevices near their food (humans), so that means headboards, bed frames, bed side tables, skirting boards etc.
So if you have bedbugs, there is no shame or embarrassment to be had. Rich and poor people get them alike.