One example: People who deliberately avoid social media, tape over webcams, use non-android, non-ios phones, who value their privacy. These people scrub the internet of their info, make aggressive use of GDPR/CCPA deletion requests. They do not want to be part of mainstream society for whatever reason. They are routinely marginalized by people around them, labelled as "weird", unjustly suspected (and accused) of all sorts of criminal activity under the premise that "privacy is for people with something to hide" - a train of thought that is concerningly common among younger generations.
Another example is anticonsumerism. People who do not use any streaming services nor purchase media. They don't blow money like there's no tomorrow on fast fashion, pointless trinkets from Amazon, exorbitant vacations that will be forgotten as quickly as they happened, or routinely eating out. These are the people with high 6 and low 7 figure net worths in their 30's driving cars that they paid $5k cash for that look like trash. These people avoid conspicuous consumption like the plague - why throw away so much money while painting a target on your back for criminals just for the approval of others, most of whom you don't even know? Screw a gym membership, exercise is free. These people are relentlessly mocked as cheapskates in spite of the fact that it's more about values than financial concerns.
Look for the hated, the despised, the mocked, and the belittled in mainstream culture to find counterculture. The counterculture movements of the 1960s went with those labels like peanut butter goes with jelly when described by the prevailing culture of the time.