Window cleaning isn't easy work, it's physically demanding, and most people who do it independently need to have other skills too - it requires some business acumen if you want to be successful at it in the long term.
That said, I do not go around telling a window cleaner how to do their job. I know what my skill set is and I try to stick to my area of expertise. The JW Elder™ who happens to be a an expert window cleaner or office custodian doesn't do that. His position as an Elder™ bestows on him a level of hubris whereby he thinks he can (and should) advise Congregation™ members in matters beyond his scope of expertise, such as medical advice, marital advice and even child-rearing advice. The WTS doesn't equip these men with appropriate training beyond parroting what the WTS has written in its Publications™, regardless of how out-of-touch-with-reality that information is, for instance, the Watchtower article "A Time To Speak" about reporting people to the Elders™ based on confidential medical information learned during the course of one's employment - a practice clearly prohibited under HIPPA and other regulations that protect medical confidentiality of patients. Despite it being over 2 decades old, that article has NEVER been re-visited, and some JWs feel it still represents appropriate behaviour.
I don't think anyone here disrespects individuals who perform this kind of honest labour at all. The disrespect deservedly goes to Elders™ who enjoy the power play over others' lives, who feel they have the authority to spout WTS-approved nonsense in the guise of "counselling" Congregation™ members, in matters in which they have no real understanding.