Wordpress mod security error

My domain routed via CloudFlare to HostGator hosting and use WordPress
I’ve tried to add retargeting pixel code and always get Mod_Security error
Contacted hosting support and they clould not help, told me to ask CloudFlare support
here is a short video what happens in real time
https://www.youtube.com/watch?v=-fCTSa-icVw&feature=youtu.be.
Could anyone help me to sort this problem?

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