How is it possible to select lines that do NOT match a specific pattern?

For example, I'm connecting to via telnet (port 23), and do tcpdump -nli rl0. This cyclic traffic, becuase when tcpdump outputs something, the system sends me some packets, which generates output in tcpdump, and vice versa. I want to filter out packets of telnet access to the FreeBSD machine, that is, something like:

    tcpdump -nli rl0 | grep --non-matching-lines
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