Unlike WDW, the ocean is real and you do need to give it a certain amount of respect and caution. They do sometimes have sharks in the Vero area. They will post warnings to that effect. The beach at Disney's resort has no lifeguard but there is a public beach just next door. The lifeguard station flies different color flags to indicate the water conditions. I'm not sure what they mean offhand but you can ask. There is also a pretty strong riptide in the waters around Vero so if you are not a strong swimmer stay close to shore (even then be careful) and NEVER swim alone.
Don't be upset about it, just be aware of the conditions.