SPedigrees
Garden Addicted
Never seen a red insulator. Mine are yellow or purple.
If they touch the insulator while mist covers it, they could complete the circuit and get zapped. Found a post on reddit of someone thinking that was their issue, so painted mine just in case.
Red ones were for sale here back in the day, but many people objected. Consequently manufacturers changed to yellow, but probably not a solution since yellow also attracts them. Mist completing the circuit makes sense, and/or maybe a tall grass stalk.
"My" hummingbirds seem sorted out into territories each with a single male and his harem. That arrangement is pretty peaceful earlier in the summer, but now many little squabbles are breaking out here, as at your house. I think the migrant birds entering this territory brought the chaos with them. They sure are feisty little critters!