The check for unsupported events types happens before any destination filter checks. As a result, Destination Filters can't prevent unsupported event type errors. To filter these events, use the[Integrations Object](/docs/guides/filtering-data/#filtering-with-the-integrations-object).

Destination filters only filter events sent after filter setup. If you just added a destination filter but still see some events going through, you're likely seeing retries from failed events that occurred before you set up the filter.

When Segment sends an event to a destination but encounters a timeout error, it attempts to send the event again. As a result, if you add a destination filter while Segment is trying to send a failed event, these retries could filter through, since they reflect events that occurred before filter setup.