The squirrels irritate me. I admit I like watching their antics, and I really admire their tenacity. However we have quit putting up home-made birdfeeders because they destroy them all. I don't mind that they dig in the mulch around my yard plants, I can even ignore the holes in the sorry lawn. But I hate it when they dig in my garden beds, and they do it constantly. I have tried spreading cayenne powder, the hottest red pepper flakes I can find, and coffee grounds. It works for a day or two- then if I forget to spread deterrents again they are right back. Rain washes it away, too. And pepper flakes in the garden make me sneeze (although I do love the smell of spread coffee grounds).
Later in the season it's just an annoyance to find holes where everything was tidy the night before, but in the springtime it's actually destructive as the squirrels will tear up my little seedlings and scatter them.