You don't need to go shouting it, but if someone starts talking politics at you, fucking own it. Some coworker is like "trump sucks", say "yeah I know, I'm a communist". Your grandpa says "trump rules", say "no he sucks ass, I'm a communist". You're on a date and they ask who you're voting for? Say "I'm a communist". Cashier asks would you like change? "Yes, I am a communist".
Be open about your politics and lay claim to the title. Be a communist.
Yeah I pretty much just tell people straight up yes I am a communist. If it were my choice I wouldn't have to charge you for this food and every person deserves to enjoy the fruits of industrialization and that we throw away almost half the food and clothes and shoes and stuff that we produce and that scarcity is largely artificially used to maximize profits. Be sure to also hit on the fact that 99% of crime is property crime that could be prevented without more police by just addressing people's material needs and conditions.