Why two guys had called me gullible?

So two guys have called me gullible. one was my friends with benefits he told me I'm very gullible. And the other guy is a guy I'm dating , he told me I'm gullible that I shouldn't believe everythung people tell me that some people lie and others don't that I can't trust just anyone. he called me gullible when we were hanging out because he kept teasing and tricking me and I kept falling for his tricks. I'm offended because I got called gullible. Should I feel this way?
Why two guys had called me gullible?
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