This is not true, according to the CDC (as of August 18th) there at least 742 cases of myocarditis and myopericarditis associated with vaccination, potentially upwards of ~1,300 [1].
For males age 16-17 the reporting rate of myopericarditis after 2 doses of Pfizer is 71.5 per 1 million doses administered (0.0071%) [1].
Compared to natural infection, vaccination is likely still a favorable tradeoff for most people. However the tradeoffs are highly dependent on age, health, and gender. Stratifying by these factors is essential for any scientifically accurate discussion of risks.
[1] https://www.cdc.gov/vaccines/acip/meetings/downloads/slides-...