I’m going to boycott reading Dostoevsky and Tolstoy and not listen to Rachmaninov and Borodin. That’ll show them Russians 
In all seriousness, the “economy” isn’t just the modern niceties like McD, Ikea floral duvet covers and Costa frappacinos... it’s fundamentally how we keep ourselves alive in a modern industrial civilisation. It’s food, and behind that, fertiliser, ag chemicals, tractor parts, tractor factories. Pharmaceuticals and their manufacturing plants and raw materials. Water processing plants with chemicals and energy to run. Roads and railways, requiring vast amounts of steel, tarmac, concrete and hardcore. Hardware and software engineering requiring masses of silicon chips and semi conductors. All industries powered by vast amounts of of coal, oil, gas, nuclear isotopes and rare earth metals for “renewables” turbines.
An economic system that ALL modern people depend on, unless you’re a reindeer herder in the Arctic or a peasant farmer in the Caucasian mountains with a herd of goats and spring water.
The collapsing Russian economy will make tens of millions destitute in a few weeks. It will be a humanitarian cataclysm worse than the Holodomor and Cultural Revolution. I put strong odds on there being full out civil war in Russia by late spring as the economy goes into freefall. Ordinary Russians can’t do anything about Putin... he was so paranoid about covid that anyone visiting him basically had to go through “human sheepdip” first (isolation for several days, then walk through a tunnel misted with disinfectant). There are pictures of him meeting his advisors where the table is about 25 metres long.
Boycotting your Costas will merely give the great bear a cute little tickle and leave the industrial infrastructure that produces the vast tranche of Russian GDP in place.